Refrigerating apparatus



Oct 1%), 19339.

L. A. PHILIPP 2,175,914

REFRIGERATING APPARATUS Filed Aug. 25, 1938 2 Sheets-Sheet 1 A}; V au-INVENTOR. Lamw'm: fl. PHIL/PP BY W W ATTOR NEY.

L. A. PHILIPP 2,175,914

REFRIGERATING APPARATUS Oct. 10, 1939.

Filed Aug. 25, 1938 2 Sheets-Sheet 2 INVENTOR. Lawlemcz H. PmuPPATTORNEY.

Patented Oct. 10, 1939 UNITED STATES PATENT OFFICE REFRIGERATINGAPPARATUS Lawrence A. Philipn, Detroit, Mich, assignor toNash-Kelvinator Corporation, Detroit, Mich", a corporation of MarylandApplication August 25, 1938, Serial No. 226,814

Claims." .(Cl. 62-115) The invention consists in providing a suitablecondenser substantially enclosing the side walls of a sealed casing, sothat at least three side walls of the sealed casing are enclosed by thecondenser, and providing a fan with a shroud which is attached to thefree ends of the condenser. Upon the operation of the fan air will bedrawn through the condenser causing the air to absorb the heat emanatingfrom the walls of the sealed casing and thereby cooling themotorcompressor unit.

The invention further consists in providing a jacket, preferably,composed of a coil of tubing, having thermal contact with the sealedcasing thereof. Connected to the ends ofthe tubing is a secondarycondenser disposed above the coil of tubing and over the top of thesealed casing. The jacket or tubing is charged with a quantity of anysuitable fluid capable of absorbing heat in such a system, for example,sulphur dioxide, or other refrigerant agents, and even water may beemployed. The liquid refrigerant in the tubing or jacket upon boiling,due to the extraction of heat from the sealed casing, will pass into thesecondary condenser in the form of vapor, where it will condense andreturn to the tubing or jacket.

The invention consists of certain novel features of construction andcombinations of parts which will be hereinafter described and set forthin the appended claims.

, In the accompanying drawings:

Figure 1 is a view partly in elevation and partly in vertical sectionillustrating the invention;

Figure 2 is a top plan view with the secondary condenser removed;

Figure 3 is a plan view of the secondary condenser; and

by entirely encircling the side wall or walls shell l0, andan annularring 20 engages the lower end of the motor I! and a' cover or buttonplate 2| for supporting the motor l1 and compressor l8 as a unit withinthe shell. The bottom or cover plate 2| is attached to the flange ll ofthe shell by bolts 22-22 for closing the shell l0 and for hermeticallysealing the motor-compressor unit within the shell Ill.

The vaporized refrigerant is returned from an evaporator l2 of arefrigerating system to the shell l0, by a conduit 23 connected by asuitable coupling 24 to the cover 2|. The refrigerant then passesthrough another conduit 25 into the interior of the shell Ill. Therefrigerant in shell I0 passes through compressor intake conduit 26,which has its inlet end in open communication with conduit 25, and thisvaporized refrigerant is compressed by the compressor Id. The compressedrefrigerant is conducted from the compressor by conduits 21 and 28 to acondenser 29. The conduits 21 and 28 are connected by a suitablecoupling 30 carried by thecover 2| for conducting the refrigerant fromthe compressor I8 to the condenser 29. The refrigerant vapor will becondensed in the condenser 29, and the liquid refrigerant will beconducted by a conduit 3| to a suitable receiver and float mechanism l3before being delivered to the evaporator l2 by means of a conduit 32which connects the receiver with theevaporator.

The condenser 29, as shown in Figures 1 and 2 is preferably made inthree sections, or of a construction to encompass, at least, three sidesor walls of the casing l0 containing the motor-compressor unit. Two ofthe sections 33, 34 are connected to the intermediate section 35 bysuitable couplings 36-36. The refrigerantdelivered from the compressor,is conducted to the condenser section 33 by the conduit 28 which isconnected thereto by a coupling 31.

The refrigerant vapor on entering the condenser section 33 will flowtherefrom into condenser section 35 and then into condenser section 34from where it will be discharged through conduit 3| to-the high sidefloat chamber or receiver |3 the refrigerant being condensed during itspassage through said sections. Each of the condenser sections 29 iscomposed of sinuous tubes 38 which are rigidly secured between endplates 39-39. The tubes 38 of the condenser sections are provided withsuitable fins 40 forming heat dissipating surfaces.

A shroud 4| is connected to the free ends of the condenser sections 33and 34 and extends across the remaining or fourth side of the sealedcasing l0, so that the three condenser sections 33, 34 and 35 and theshroud 4i encircle the sealed casing l0. The shroud is provided with atubular opening 42 in which is disposed a fan 44 conected to a motor 45,driven from -a suitable source of power.

Encircling the casing it, of the compressormotor unit, is a coil oftubing 46 which is charged with a quantity of fluid capable of absorbingheat. Any suitable refrigerant fluid may be employed, such as sulphurdioxide or even water. The ends 41-41 of the coiled tubing are connectedto the headers 48-48 of a secondary condenser 50 disposed across the topof the sealed casing Ill preferably at a slight angle, so that one ofthe headers 4'! will be at a higher elevation thanthe other. Thecondenser 50, may be of any preferred construction, but as illustrated.consists of headers 48-48 having a series of tubes 5l--5l interposedtherebetween and connected to the headers for the circulation of thecooling agent. The tubes 5| are provided with fins 52 for dissipatingthe heat.

The refrigerant or cooling agent contained in the coiled tubing 48 willcirculate and be caused to boil within the tubing as the heat isextracted from the sealed casing Ill and motor-compressor units l 1-48,and the vapors emanating from the cooling medium will enter thecondenser 50 through one of the tubes 41, where the vapors willcondense'and the condensed liquid will return through the other tube 41from the condenser to the coiled tube ;46 for further circulation andcooling. The coiled tube 48 and condenser II therefore act as a heatexchanger for the sealed casing ll of the motor-compressor unit inextracting the heat generated 'during the operation of the unit.

The several units or sections of the condenser 29 encompassing threesides of the sealed casing l0, and the fan 44 and shroud 4| at one endthereof, provide an enclosure, so that as the fan 44 is driven, air isdrawn through the several condenser sections 33, 34 and I5 aroimd thewalls or sides of the sealed casing, and at the same time air is beingdrawn through the secondary condenser 50 positioned within the area ofthe condenser 29 and over the top of the sealed casing. Therefore, heatis being extracted from the condensers 29 and 5| and from the top andside walls of the sealed casing ll, at the same time by the suctioncreated by the fan 44 in drawing the air over the sealed casing.Furthermore, the sealed casing is being additionally cooled by thecooling medium of the coiled tubing 40. In this manner heat is beingdissipated from the motor-compressor unit and its sealed casing by acompact arrangement of the several condensers, and making it possible toemploy such a system in the machine compartment of a domesticrefrigerator cabinet. I

In Figure 4 is disclosed a condenser which may be employed in lieu ofthat shown in Figures 1 and 2. This condenser is constructed of a bankof sinuous tubing BI, and adapted to enclose three join the intermediateportion. Pins 51 are prosaid sealed casing and connected to the combereadily accomplished by inserting the condensing unit in the machinecompartment of a household refrigerator and providing a flue forinducing a flow of natural air convection currents over the condensingunit and through the 5 flue. In this case it may be desirable to extendthe condenser around all four sides of the motor compressor unit insteadof only three sides. In this case the four sided condenser may be spacedlaterally and vertically from the bottomof the 1 dome so that air maypass upwardly through the condenser and about the dome. A refrigeratorcabinet utilizing a flue construction suitable for use in connectionwith the condensing unit disclosed herein is as disclosed in Patent No.1,673, 1 082 to Alfred S. Lewis, patented June 12, 1928.

By providing coils 46 which surround the motor compressor unit a veryemcient heat removal arrangement is provided. Coils 48 may be rigidlysecured to the compressor dome by fusion, such as welding or soldering.By utilizing the secondary condenser for cooling the compressor,effective cooling takes placeand the secondary condenser does nottransmit noises from the motor compressor unit as is the case wherelarge heat transfer flns are secured to the motor-compressor dome todissipate heat from the dome.

Although only a preferred form of the invention has been illustrated andthat form described in detail, it will be apparent to those skilled in 3the art that various modifications may be made therein without departingfrom the spirit of the invention or from the scope of the appendedclaims.

What I claim is: 3

1. Refrigerant apparatus, comprising a sealed casing housing amotor-compressor unit, a condenser for receiving a refrigerant fluiddischarged from said compressor, means for containing a cooling fluidassociated with said casing in heat exchange relation therewith, and acondenser connected to said means and overlying said casing forradiating the heat absorbed therey.

2. Refrigerant apparatus, comprising a sealed casing housing amotor-compressor unit, a condenser substantially enclosing the sidewalls of said sealed casing and connected to the compressor forreceiving compressed refrigerant therefrom, means for containing acooling fluid associated with said casing in heat exchange relationtherewith, a condenser connected to said means and overlying said casingfor radiating the heat absorbed thereby, and means for drawing airthrough said condensers and over the walls of said casing for extractingthe heat therefrom.

3. Refrigerant apparatus, comprising a sealed; casing housing amotor-compressor unit, a condenser substantially enclosing the sidewalls of pressor for receiving compressed refrigerant therefrom, meansfor containing a cooling fluid associated with said casing in heatexchange relation therewith, a condenser connected to said means andoverlying said casing for radiating the heat absorbed thereby, a shroudarranged at a side of said casing and connected to said first mentionedcondenser for forming an enclosure for said casing, said shroud'havingan opening therein, and a power driven fan positioned adjacent saidshroud opening for drawing air through said condensers and over thewalls and top of said casing for extracting the heat therefrom.

4. Refrigerating apparatus, comprising a scaled casing housing amotor-compressor unit;

annour a condenser encom three sides of said sealed casing and forreceiving compressed reirigerant from said compresso a shroud arrangedat the remaining side of said casing and connected to the condenser forforming an enclosure-for said casing, said shroud having an openingtherein, and a power driven faii' positioned with respect to the openingof the shroud for drawing air through said condenser and shroud and overthe sides of said casing Ior extracting the heat thereof;

5. Refrigerating apparatus, comprising a casing housing amotor-compressor unit, means for containing a cooling fluid associatedwith said casing in heat exchange relation therewith, a condenserconnected to said means and overly n at least part of said casing forradiating the heat absorbed thereby, and a condenser for receiving fluiddischarged from the compressor and positioned along the side wall ofsaid casing.

mwnmcn a, PmuPP.

